Bash 脚本检查是否存在多个组

Question

我需要使用命令

将用户添加到多个补充组

usermod -aG group1,group2 username

如果 /etc/group 文件中存在多个组，则需要帮助检查脚本的错误以进行搜索。这就是我的。

read -p "Enter groups" groups
if (Check if those groups exists)
then
  usermod -aG "$groups $username
else
  echo "Group(s) does not exists"
fi

请帮忙谢谢！对不起，我是新手，如果可能的话让我知道一些阅读链接。

好吧，我想出了一些实际有效的方法。如果有人可以 "cleaned" 将不胜感激。 XD

    read -p "Enter user" user
    read -p "Enter groups" groups
    storegroups=$(echo $groups | awk -F, '{print " "" "}')
    if [ "$(getent group $storegroups | wc -l)" == $(echo $storegroups | wc -w)" ]
    then 
        usermod -ag $groups $user
    else
        echo "1 or more groups does not exists"
    fi

Answer 1

#!/bin/bash

read -p "Enter username: " username
read -p "Enter groups: " groups

for g in ${groups//,/ }; do
  grep -q "^$g:" /etc/group
  ret=$?                         # save returncode of grep
  if [[ $ret -eq 0 ]]; then
    usermod -aG "$g" "$username"
  else
    echo "Group $g does not exists"
  fi
done

Answer 2

read -p "Enter user: " user
read -p "Enter groups: " groups

# Replace , with space
groupswithSpace=$(echo $groups | tr ',' ' ')

#getent returns 0 only if all groups are valid
getent group $groupswithSpace > /dev/null

if [ $? -eq 0 ]
then
    usermod -ag $groups $user
else
    echo "1 or more groups does not exists"
fi

Bash 脚本检查是否存在多个组

Bash scripting check if multiple groups exists

unix

bash

scripting

awk

grep